When I run the graph I hear my audio mostly clearly but with a lot of static. However if I configure the graph as such:

File Player AU -> Remote IO (Removing the varispeed)

My audio comes through perfectly.

I realize this issue is solved by setting the stream format of one or many of these audio units. However, after reading number of document's (including Apple's) I'm completely lost as to where and how I need to set the stream format.

Do I need to explicitly set the AUCanonical format on the file player output?